Sharp MX-6500N / MX-7500N (serv.man27) Service Manual ▷ View online
MX-7500N OPERATIONAL DESCRIPTIONS 13 – 13
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MX-7500N OPERATIONAL DESCRIPTIONS 13 – 14
Signal name
Name
Function/Operation
CPFM
Paper feed motor
Drives the paper feed section and the transport section.
T1LUD
Tandem tray 1 upper limit detector
Detects the upper limit position of the upper limit tandem tray 1.
T1LUM
Paper tray lift motor (Tandem tray 1)
Drives the lift of the paper tray.
T1PED
Tandem tray 1 paper empty detector
Detects presence of paper in tandem tray 1
T1PUC
Tandem tray 1 paper feed clutch
Controls ON/OFF of the paper feed roller in the tandem tray 1 paper feed section.
T1PUS
Paper pickup solenoid (Tandem tray 1)
Controls the paper pickup.
T1SPD
Tandem tray 1 paper remaining quantity detector
Detects the remaining paper quantity in tandem tray 1.
T2LUD
Tandem tray 2 upper limit detector
Detects the upper limit position of tandem tray 2.
T2LUM
Paper tray lift motor (Tandem tray 2)
Drives the lift of the paper tray.
T2PED
Tandem tray 2 paper empty detector
Detects paper presence in tandem tray 2.
T2PUC
Tandem tray 2 paper feed clutch
Controls ON/OFF of the paper feed roller in the tandem tray 1 paper feed section.
T2PUS
Paper pickup solenoid (Tandem tray 2)
Controls the paper pickup.
T2SPD
Tandem tray 1 paper remaining quantity detector
Detects the remaining paper quantity in tandem tray 2.
TNDSET
Tandem tray installation detector
Detects installation of tandem tray.
No.
Name
Function/Operation
1
Paper pickup roller (Tandem 1, 2 paper feed tray)
Picks up paper to send to the paper feed roller.
2
Paper feed roller (Tandem 1, 2 paper feed tray)
Feeds paper to the paper transport section.
3
Separation roller (Tandem 1, 2 paper feed tray)
Separates paper to prevent double-feeding.
4
Torque limiter
Applies a certain level of resistance power to rotation of the separation roller in order to
prevent against double feed.
prevent against double feed.
5
Lift wire
Transmits the drive power of the paper tray lift motor to the paper feed tray.
MX-7500N OPERATIONAL DESCRIPTIONS 13 – 15
(3)
Tray paper feed section
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MX-7500N OPERATIONAL DESCRIPTIONS 13 – 16
B. Operational descriptions
(1)
Bypass
The pickup roller moves up and down to press the paper surface,
separating the paper on the top of the paper bundle and sending it
to the paper feed roller section.
separating the paper on the top of the paper bundle and sending it
to the paper feed roller section.
The paper feed roller feeds paper to the transport section to pre-
vent against double feed with the separation roller. The manual
paper feed clutch controls ON/OFF of the pickup roller and the
paper feed roller. Paper is sent to the registration roller by the man-
ual transport roller.
vent against double feed with the separation roller. The manual
paper feed clutch controls ON/OFF of the pickup roller and the
paper feed roller. Paper is sent to the registration roller by the man-
ual transport roller.
(2)
Tandem paper feed
a. Paper size for each paper feed tray
Paper tray 1 accepts paper of A4, 11” x 8.5”, or B5. Paper tray 2
accepts paper of A4 (11” x 8.5”) only.
accepts paper of A4 (11” x 8.5”) only.
b. Paper feed operation
1)
When the copy/print operation is started, the motor (CPFM)
and the clutch (T1PUC) are turned ON to turn ON the solenoid
(T1PUS) at the timing of paper pickup. This rotates the takeup
roller and lowers it to pick up paper.
and the clutch (T1PUC) are turned ON to turn ON the solenoid
(T1PUS) at the timing of paper pickup. This rotates the takeup
roller and lowers it to pick up paper.
2)
At the same time, the paper feed roller rotates to feed paper to
the transport section. At that time, the separation roller rotates
to prevent double feed of paper.
the transport section. At that time, the separation roller rotates
to prevent double feed of paper.
(3)
Tray paper feed
a. Paper feed front operation
- Set paper and insert the paper feed tray, and the pickup roller
falls to turn ON the paper feed tray sensor.
- The lift-up motor drives the rotating plate to move it up.
- The paper upper limit sensor turns ON, and the rotation plate
stops at the specified position.
Signal name
Name
Function/Operation
C3LUD
Tray 3 upper limit detector (Lift
home position detection)
home position detection)
Detects the upper limit position of tray 3.
C3LUM
Paper tray lift motor (Tray 3)
Drives the lift of the paper tray.
C3PED
Tray 3 paper empty detector
Detects paper presence in tray 3.
C3PFD
Tray 3 paper entry detector
Detects paper entry from tray 3.
C3PUC
Tray 3 paper feed clutch
Controls ON/OFF of the paper feed roller in the tray 3 paper feed section.
C3PUS
Paper pickup solenoid (Tray 3)
Controls pickup of paper.
C3SPD
Tray 3 remaining quantity detector
Detects the remaining paper quantity in tray 3.
C3SS1
Tray 3 rear edge detector 1
Either of rear edge 1 - 4 of tray 3 is detected to detect tray insertion.
The paper size of tray 3 is detected.
The paper size of tray 3 is detected.
C3SS2
Tray 3 rear edge detector 2
C3SS3
Tray 3 rear edge detector 3
C3SS4
Tray 3 rear edge detector 4
C4LUD
Tray 4 upper limit detector (Lift
home position detection)
home position detection)
Detects the upper limit position of tray 4.
C4LUM
Paper tray lift motor (Tray 4)
Drives the lift of the paper tray.
C4PED
Tray 4 paper empty detector
Detects paper presence in tray 4.
C4PFD
Tray 4 paper entry detector
Detects paper entry from tray 4.
C4PUC
Tray 4 paper feed clutch
Controls ON/OFF of the paper feed roller in the tray 4 paper feed section.
C4PUS
Paper pickup solenoid (Tray 4)
Controls pickup of paper.
C4PWD
Casette 4 width detection
Casette 4 width detection
C4SPD
Tray 4 remaining quantity detector
Detects the remaining paper quantity in tray 4.
C4SS1
Tray 4 rear edge detector 1
Either of rear edge 1 - 4 of tray 4 is detected to detect tray insertion.
The paper size of tray 4 is detected.
The paper size of tray 4 is detected.
C4SS2
Tray 4 rear edge detector 2
C4SS3
Tray 4 rear edge detector 3
C4SS4
Tray 4 rear edge detector 4
CPFM
Paper feed motor
Drives the paper feed section.
PTRC1
Casette Vertical transport clutch
Casette Vertical transport clutch control
No.
Name
Function/Operation
1
Paper pickup roller (Paper feed tray 3, 4)
Picks up paper to send to the paper feed roller.
2
Paper feed roller (Paper feed tray 3, 4)
Feeds paper to the paper transport section.
3
Separation roller (Paper feed tray 3, 4)
Separates paper to prevent double-feeding.
4
Torque limiter
Applies a certain level of resistance power to rotation of the separation roller in order to prevent against
double feed.
double feed.
5
Transport roller 1 (Drive)
Transports paper fed from the paper feed tray 4 to the transport roller 2.
6
Transport roller 2 (Drive)
Transports paper from the transport roller 1 to the transport roller 4.
7
Transport roller 3 (Drive)
Transports paper fed from the paper feed tray 3 to the transport roller 4.
8
Transport roller 4 (Drive)
Transports paper from the transport roller 2 and the transport roller 3 to the transport roller 5.
9
Paper size detection plate
This plate shifts its position in conjunction with the rear edge plate, and the rear edge is detected to detect
the paper size.
the paper size.
10
Lift plate
Lifts paper to maintain the paper feed position at a certain level.
11
Regulation plate
Regulates paper in the transverse direction.
12
Rear edge plate
Regulates paper in the longitudinal direction.
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